Question

You have been asked to prepare 100 mL of a 1% solution of sodium dodecyl sulfate (SDS), which is supplied in powder form. To do this,

Group of answer choices

A. add 1 g of SDS to 100 mL of water.

B. add water to the 1 g of SDS to make 100 mL.

C. do either the A answer or the B answer - it doesn't matter.

D. you should bribe a classmate to do it for you.

Answer 1

1% solution means 1g of SDS is present in 100mL of solution.

So for the preparation of this solution you need to add water in 1g of SDS sample upto 100mL mark .

Thus option (B) is the correct answer.

Adding 1g of SDS to 100mL water will make total volume of solution more than 100mL and thus option (A) is different from B .

For this solution preparation, take a 100mL volumetric flask and add 1g SDS into it . Then add 20-30mL of water and dissolve the SDS into it completely and then fill the volumetric flask with water upto 100mL mark. Thus formed solution is 1% SDS solution.

Option (B) is correct .